ClassEditPage classEditor = classSheetPage.clickDefineClassLink();
classEditor.addProperty("color", "String").setPrettyName("Your favorite color");
classEditor.clickSaveAndView();
// Add a new property.
classEditor = classSheetPage.clickEditClassLink();
classEditor.addProperty("age", "Number").setPrettyName("Your current age");
classEditor.clickSaveAndView();
// We have to wait for the page to load because Selenium doesn't do it all the time when we click on Save & View
// (even if the Save & View button triggers a plain form submit; there must be something with the JavaScript